WASHINGTON — Listen up, voters, you’re the boss. Your employee has barely produced for the past two years, has hardly showed up for work, hasn’t cooperated with others and has gotten low marks on every evaluation. Time to fire ’em, right? Wrong.

When the results are counted Tuesday, Americans will likely have rehired a big majority of the House and Senate despite railing for months about an ineffective, bitterly divided Congress.

At least 15 senators of the 22 seeking re-election are expected to cruise to new terms. The same is true for at least 330 House members from coast to coast, based on interviews with Republicans and Democrats, opinion polls and a tally of noncompetitive races.

There have been some close calls. Twenty-one-term Rep. Charlie Rangel faced a scare in his primary but probably will win in his heavily Democratic New York City district. Sen. Orrin Hatch fought off a Tea Party challenge and is expected to easily win a seventh term in solidly Republican Utah. Ethics and sex scandals — even skinny dipping in the Sea of Galilee — won’t stop other incumbents.

Yet in survey after survey this year, Americans overwhelmingly have given Congress an approval rating in the low double digits. Even its members joke darkly about their standing compared to, say, used-car salesmen or tax collectors or journalists.

Support for Congress, Sen. John McCain, R-Ariz., has often said, is “down to paid staffers and blood relatives.”

In two years of partisan backbiting and brinkmanship over the nation’s finances, the current Congress has produced just 196 laws, including quite a few renaming post offices or appointing members to the board of the Smithsonian Institution. The once-easy work such as a transportation bill took months of wrangling.

Compare that with the 460 laws of President George W. Bush’s two years with a Democratic Congress or the Watergate-era 649 laws.

Congress hasn’t been around Washington much of the time. Lawmakers have been in session about 220 days in the past two years of Tuesday-to-Thursday afternoon workweeks that would prompt an avalanche of attendance demerits.

Still, Americans will likely reward this level of performance. Why?

Tim Storey, an elections analyst with the National Conference of State Legislatures, cites post-census redistricting in which Republicans and Democrats shore up incumbents and create a significant number of safe, noncompetitive House districts.

But Storey points out that the district boundaries reflect a geographical and cultural reality: The United States is a nation of clusters.

“It takes a real quick look at voting patterns geographically to realize that we are very sort of clustered in heavily partisan ways,” Storey said. “And so when you start drawing maps, many of these districts, you can’t unless you extraordinarily contort the lines, you’re always going to have some number of districts, a large number, that are heavily Republican and heavily Democratic. So that is the nature of a geographic dispersion along party lines.”

Advantage: Incumbents

The re-election percentage for House incumbents in the modern era — 1964 to 2010 — has rarely dipped below 80 percent, even in “wave” election years when the president saw members of his party sent packing, such as Bill Clinton in 1994 (52 House seats lost), George W. Bush in 2006 (30 seats lost) and Barack Obama in 2010 (63 seats lost).

Senate re-election hasn’t always been as sure a thing. In 1980, when Republican Ronald Reagan ousted Democratic President Jimmy Carter from the White House, nine Senate incumbents fell and the re-election percentage for incumbents fell to 55 percent. Two years later, however, it was back up to 93 percent. The Associated Press

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